and will focus entirely on foreign policy. cbs face the nation host, bob schiefer moderates. >> we need to tackle our nation's challenges before they tackle us. we need to save and strengthen medicare and social security and we're putting the ideas on the table how to do that. we're not going to try to scare seniors. we'll save these benefits for seniors and for my generation so these promises are kept. >> they have laid out clearly, they say, that what barack obama and joe biden did they have endangered medicare. they have stole money from medicare and they have done it to get obamacare and all this. and you see it in the ads and hear it in everything they say. nothing could be further from the truth. >> next thursday night, october 11th, congressman paul ryan and vice president joe biden will face off in their only debate. abc news's martha radditz moderates from center college in danville, kentucky. you can watch and engage with c-span in the live debate preview at 7:00 p.m. iron and following the debate at 9:00. e-mails, calls and tweets at 10:30. c-span radio and c-span online at c-span.org.